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As I understand it, the Federal Trade Commission (or some other flakes in a government office) have a "standard" profile of partial highway and partial city roads that the manufacturers are suppose to test their vehicles on.
It's the EPA flakes.
The "City" and "Highway" mpg figures are standards for comparison of different or similar vehicles.
Figuring your own fuel usage is kind of up to the individual. If you spend all day idling down a gridlocked f-way or between stop lights you will, of course, have different figures than someone who spends all day on the open road at regular speeds. Whatever method you wish to use.
Distance per volume works because we're all used to it.
Contra todo mal, mezcal; contra todo bien, también
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